In road construction the existing soil has many inherent flaws including various problems such as non-uniform consistency, unstable soil, moisture problems, tensile strength and loose soil.This study was considered with the use of geogrid to strengthen the rigid pavement .Weaker soils are generally clayey and expansive in natures which are having lesser strength characteristics. Technique of improving the soil with geogrid increase the stiffness and load carrying capacity of the soil through fractional interaction between the soil and geogrid material improving black cotton soil. The load coming on the road crust is transferred to the underlying soil. If the soil supporting the road crust is weaker, the crust thickness of road increases, which leads to the more cost of construction. To achieve the economy and for proper performance of road, it is necessary to improve the soil. Geogrid benefits include ease construction, increased life of the structure and reduce maintenance requirement and also reduce cost of construction, easy to repair or easy to installed.